P04EDEVAP System Large Leak Detected - Fresh Air Side
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Needs a drive cycle to confirm a fix
- How the car detects it
- Hybrids with a sealed fuel tank have a valve separating the tank from the charcoal canister and its vent side. CARB allows such sections to be leak-checked separately with their own codes; a Ford patent checks the tank side via tank pressure with the valve closed and the canister side with a leak check module. Conventional systems report the same leak as P0442, P0455 or P0456. P04ED reports a large leak in the canister and vent section: the leak check module builds up no meaningful vacuum – line off, canister broken, vent valve open. Purging may be suspended. No manufacturer document available to us names this code; the description follows CARB and the Ford patent.
- What you may notice
- Check engine light on
- Possibly check fuel cap message or slight fuel smell
- No change in driving
- Likely causes
- LikelyLine at the canister or leak check module off or broken
- PossibleVent valve or leak check module not closing
- PossibleCanister housing cracked
- RarePurge valve stuck open
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Medium · Usually a job for a workshop.Typical cost: €40 – €450
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.